Hello,
I have an intermittent coolant leak on my classic which has a XS firewall forward package.
Is it possible to remove the water pump from the engine while it is in situ on the aircraft?
In spite of doing pressure tests, running the aircraft with the cowlings off I have been on the unable to trace the origin of the leak, it does not leak cold with a pressure of 1,4 bars.
On some flights there is no discernible leak, on others I have lost up to 150 ml during a two hour flight.
There is a bit of a white deposit on the exhaust heat shield underneath the water pump. I have also found liquid on the aluminium plate above the radiators but the air passage through the radiators has always been dry.

I would rather be sure of where the leak is coming from prior to taking anything apart. Does anyone have some experience or knowledge they could share with me?

Regards,
John

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I have had two leaks on mine; the first was from new and on the port side 1" pipe joint above the radiator, I concluded when shutting down the water, no longer circulating, heated here from the exhaust and engine and wept out of the vertical joint. I changed to silicone pipe, wrapped it in insulation webbing and used a better quality clamp.

The second leak was a tiny hole in the radiator.

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There is a drain hole under the water pump which is designed to allow water to exit that has passed the water pump seal, so that it does not enter the crankcase through the oil seal.
The Manual Shows an engine Strip down to Change the seal but I have done it in situe from under the plane. A fiddle, but possible.
Mine is a 912 on a Classic mono so your Access could be different.

Best of luck

Barry

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